Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 9, Issue 51, Pages 17207-17213Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.1c06607
Keywords
Hemp hurd; Lignin; Biomass valorization; Reductive catalytic fractionation; Organosolv pulping; Dissolving pulp; Nanocellulose; Monophenolic compounds
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Funding
- Bio Based Industries Joint Undertaking under the European Union [744349]
- Swedish Foundation for Strategic Environmental Research (Mistra:project Mistra SafeChem) [2018/11]
- H2020 Societal Challenges Programme [744349] Funding Source: H2020 Societal Challenges Programme
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The study showed a method to convert hemp hurd into high-content monophenolic compounds through RCF technology, resulting in dissolving-grade pulp and nanocellulose suitable for textile fiber production. This method may increase textile fiber production and obtain bio-oil for green chemicals.
Despite the increased use of hemp fiber, negligible attention has been given to upgrade the hemp hurd, which constitutes up to 70 wt % of the hemp stalk and is currently considered a low-value byproduct. In this work, valorization of hemp hurd was performed by reductive catalytic fractionation (RCF) in the presence of a metal catalyst. We found an unexpectedly high yield of monophenolic compounds (38.3 wt %) corresponding to above 95% of the theoretical maximum yield. The high yield is explained by both a thin cell wall and high S-lignin content. In addition, organosolv pulping was performed to generate a pulp that was bleached to produce dissolving-grade pulp suitable for textile fiber production (viscosity, 898 mL/g; ISO-brightness, 90.2%) and nanocellulose. Thus, we have demonstrated a novel value chain from a low-value side stream of hemp fiber manufacture that has the potential to increase textile fiber production with 100% yield and also give bio-oil for green chemicals.
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